"use client";

/**
 * pop-string-list 디자이너 미리보기
 *
 * 디자인 모드에서 캔버스에 표시되는 간략한 미리보기.
 * 실제 데이터는 가져오지 않고 더미 데이터로 레이아웃만 시각화.
 */

import type { PopStringListConfig } from "./types";

interface PopStringListPreviewProps {
  config?: PopStringListConfig;
}

export function PopStringListPreviewComponent({
  config,
}: PopStringListPreviewProps) {
  const displayMode = config?.displayMode || "list";
  const header = config?.header;
  const tableName = config?.dataSource?.tableName;
  const listColumns = config?.listColumns || [];
  const cardGrid = config?.cardGrid;

  // 테이블 미선택
  if (!tableName) {
    return (
      <div className="flex h-full w-full items-center justify-center p-2">
        <span className="text-[10px] text-muted-foreground">
          테이블을 선택하세요
        </span>
      </div>
    );
  }

  return (
    <div className="flex h-full w-full flex-col overflow-hidden">
      {/* 헤더 */}
      {header?.enabled && (
        <div className="shrink-0 border-b px-2 py-1">
          <span className="text-[10px] font-medium">
            {header.label || "리스트 목록"}
          </span>
        </div>
      )}

      {/* 모드별 미리보기 */}
      <div className="flex-1 overflow-hidden p-1">
        {displayMode === "list" ? (
          <ListPreview columns={listColumns} />
        ) : (
          <CardPreview cardGrid={cardGrid} />
        )}
      </div>

      {/* 모드 라벨 */}
      <div className="shrink-0 border-t px-2 py-0.5">
        <span className="text-[8px] text-muted-foreground">
          {displayMode === "list" ? "리스트" : "카드"} | {tableName}
        </span>
      </div>
    </div>
  );
}

// ===== 리스트 미리보기 =====

function ListPreview({
  columns,
}: {
  columns: PopStringListConfig["listColumns"];
}) {
  const cols = columns || [];

  if (cols.length === 0) {
    return (
      <div className="flex h-full items-center justify-center">
        <span className="text-[8px] text-muted-foreground">컬럼 미설정</span>
      </div>
    );
  }

  const gridCols = cols.map((c) => c.width || "1fr").join(" ");
  const dummyRows = 3;

  return (
    <div className="w-full">
      {/* 헤더 */}
      <div
        className="border-b bg-muted/50"
        style={{ display: "grid", gridTemplateColumns: gridCols }}
      >
        {cols.map((col) => (
          <div
            key={col.columnName}
            className="px-1 py-0.5 text-[8px] font-medium text-muted-foreground truncate"
          >
            {col.label}
          </div>
        ))}
      </div>
      {/* 더미 행 */}
      {Array.from({ length: dummyRows }).map((_, i) => (
        <div
          key={i}
          className="border-b last:border-b-0"
          style={{ display: "grid", gridTemplateColumns: gridCols }}
        >
          {cols.map((col) => (
            <div
              key={col.columnName}
              className="px-1 py-0.5"
            >
              <div className="h-2 w-3/4 rounded bg-muted animate-pulse" />
            </div>
          ))}
        </div>
      ))}
    </div>
  );
}

// ===== 카드 미리보기 =====

function CardPreview({
  cardGrid,
}: {
  cardGrid: PopStringListConfig["cardGrid"];
}) {
  if (!cardGrid || cardGrid.cells.length === 0) {
    return (
      <div className="flex h-full items-center justify-center">
        <span className="text-[8px] text-muted-foreground">
          카드 레이아웃 미설정
        </span>
      </div>
    );
  }

  // 더미 카드 2장
  return (
    <div className="space-y-1">
      {[0, 1].map((i) => (
        <div
          key={i}
          className="rounded border"
          style={{
            display: "grid",
            gridTemplateColumns: cardGrid.colWidths.join(" "),
            gridTemplateRows:
              cardGrid.rowHeights?.join(" ") ||
              `repeat(${cardGrid.rows}, 1fr)`,
            gap: `${cardGrid.gap}px`,
            minHeight: "24px",
          }}
        >
          {cardGrid.cells.map((cell) => (
            <div
              key={cell.id}
              className="flex items-center justify-center"
              style={{
                gridColumn: `${cell.col} / span ${cell.colSpan}`,
                gridRow: `${cell.row} / span ${cell.rowSpan}`,
                border: cardGrid.showBorder
                  ? "1px dashed hsl(var(--border))"
                  : "none",
              }}
            >
              <div className="h-2 w-3/4 rounded bg-muted animate-pulse" />
            </div>
          ))}
        </div>
      ))}
    </div>
  );
}